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Yang Y.,Powertrain R and D Institute of Changan Automobile Co. | Jiang W.,Powertrain R and D Institute of Changan Automobile Co. | Yang K.,Powertrain R and D Institute of Changan Automobile Co. | Chen X.,Powertrain R and D Institute of Changan Automobile Co. | And 3 more authors.
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2014

Aiming at solving the problem that the water pump has low efficiency in the cooling system of a turbochargered PFI (port fuel injection) gasoline engine, a combined 1D and 3D CFD optimization simulation work was conducted. Firstly, according to maximum thermal load taken away by the engine cooling system, the total flow rate requirement of the water pump was determined. In addition, the required total head of the water pump was calculated numerically by a 1D CFD software Flowmaster. Based on the requirement of flow rate and head, the detailed geometry design of the pump was conducted. The centrifugal shrouded impeller was designed with the leading edge of the blade inclining to pressure side. The volute was designed by applying an trapezoidal cross section with expansion channel method. Finally, the impeller and volute were analyzed by a 3D CFD software, and redesign and optimization can be done. The computed results show that the calculated and experimental values are in excellent agreement, and the difference is less than 5%. The new designed water pump satisfies the requirement. In addition, the total efficiency of the new pump is increased by 26% while the NPSHR (net positive suction head) is decreased by 0.4 m. The pressure contour results demonstrate that the pressure distribution in the new pump is more uniform. Due to the elimination of low velocity vortex in original volute, the energy loss is decreased and the energy transfer efficiency is increased in this new pump.

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